Nickel oxide micropowder and method for producing same

Patent metadata

Field	Value
Publication number	US-9790099-B2
Application number	US-201214237418-A
Country	US
Kind code	B2
Filing date	Aug 6, 2012
Priority date	Aug 6, 2011
Publication date	Oct 17, 2017
Grant date	Oct 17, 2017

Abstract

Nickel hydroxide obtained by neutralizing an aqueous nickel sulfate solution with an alkali is heat-treated in a non-reducing atmosphere at a temperature higher than 850° C. but lower than 1050° C. to form nickel oxide particles, and a sintered compact of nickel oxide particles that may be formed during the heat treatment is pulverized by preferably allowing the nickel oxide particles to collide with one another. The thus obtained nickel oxide fine powder has a sulfur content of 400 mass ppm or less, a chlorine content of 50 mass ppm or less, a sodium content of 100 mass ppm or less, and a specific surface area of 3 m 2 /g or more but less than 6 m 2 /g.

First claim

The invention claimed is:

1. A method for producing a nickel oxide fine powder having a sulfur content of 400 mass ppm or less, a specific area of 3 m 2 /g or more but less than 6 m 2 /g, a chlorine content of 50 mass ppm or less, and a sodium content of 100 mas ppm or less, said method comprising the steps of:
neutralizing an aqueous nickel sulfate solution with an alkali to obtain nickel hydroxide particles under controlled conditions of a reaction liquid temperature to be 50 to 70° C. and a reaction liquid pH to be 8.3 to 9.0 such that a sulfur component is incorporated as a sulfate into a surface of or an interface between nickel hydroxide particles;
heat-treating the obtained nickel hydroxide particles in a non-reducing atmosphere at a temperature higher than 850° C. but lower than 1050° C. to form nickel oxide particles; and
pulverizing a sintered compact of nickel oxide particles that may be formed during the heat treatment.

2. The method for producing a nickel oxide fine powder according to claim 1 , the heat-treating step is performed at a temperature higher than 950° C. but lower than 1050° C.

3. The method for producing a nickel oxide fine powder according to claim 2 , wherein the aqueous nickel sulfate solution has a nickel concentration of 50 to 150 g/L.

4. The method for producing a nickel oxide fine powder according to claim 3 , wherein the pulverizing is performed by allowing the nickel oxide particles that may contain the sintered compact to collide with one another.

5. The method for producing a nickel oxide fine powder according to claim 4 , wherein the pulverizing is performed by a dry method.

6. The method for producing a nickel oxide fine powder according to claim 2 , wherein the pulverizing is performed by allowing the nickel oxide particles that may contain the sintered compact to collide with one another.

7. The method for producing a nickel oxide fine powder according to claim 6 , wherein the pulverizing is performed by a dry method.

8. The method for producing a nickel oxide fine powder according to claim 1 , wherein the aqueous nickel sulfate solution has a nickel concentration of 50 to 150 g/L.

9. The method for producing a nickel oxide fine powder according to claim 8 , wherein the pulverizing is performed by allowing the nickel oxide particles that may contain the sintered compact to collide with one another.

10. The method for producing a nickel oxide fine powder according to claim 9 , wherein the pulverizing is performed by a dry method.

11. The method for producing a nickel oxide fine powder according to claim 1 , wherein the pulverizing is performed by allowing the nickel oxide particles that may contain the sintered compact to collide with one another.

12. The method for producing a nickel oxide fine powder according to claim 11 , wherein the pulverizing is performed by a dry method.

Assignees

• Yonesato Norimichi
• Ito Tai
• Sumitomo Metal Mining Co

Inventors

• Yonesato Norimichi
• Ito Tai

Classifications

• C01P2006/80

  Compositional purity · CPC title

• Y10T428/2982

  Particulate matter [e.g., sphere, flake, etc.] · CPC title

• C01G53/04 Primary

  Oxides · CPC title

• C01P2006/12

  Surface area · CPC title

• C01P2004/61

  Micrometer sized, i.e. from 1-100 micrometer · CPC title